Transcription of Visit www.carrier.com Troubleshooting Guide
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Visit www.carrier.com Troubleshooting Guide
58 MVPV ariable- speed 2-StageElectronic Condensing FurnaceTroubleshooting GuideNOTE:Read the entire instruction manual before starting CONSIDERATIONSINDEXPAGEI nstructions ..1 Example ..2 Sequence of Mode-Two Heat Mode ..3 Heat Pump Fan Mode ..4 Component Humidifier Mode ..5 Zone Mode ..5 Start Label/Fault Code Instructions ..7-8 Improper Operation With No Flashing Fault Code ..9 Not Enough Cooling Airflow ..10 High-Fire Temperature Rise Too Low (Cold Blow) ..11 LEDs 1, 2, 3, or 4 On LED2 Flashing ..12 Fault Code 11 No Fault in Recent History Display ..13 Fault Code 12 Blower Calibration Code 13 Limit Switch Code 14 Ignition Code 21 Invalid Model Code 22 Set Up Code 23 Invalid Blower Airflow Selection.
1. Prepurge period—The inducer motor is turned on and slowly comes up to speed. When low-pressure switch closes, inducer motor RPM is noted by microprocessor, and a 25 sec prepurge period begins. The RPM is used to evaluate vent system resistance. This evaluation is then used to determine required RPM necessary to operate inducer in low-heat ...
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